mirror of https://github.com/CGAL/cgal
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@ -4,16 +4,17 @@ namespace CGAL {
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\ingroup PkgConvexHull3Functions
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\brief computes robustly the intersection of the halfspaces defined by the planes contained in the range [`begin`, `end`) without constructing the dual points. The result is stored in the polyhedron `P`.
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If `origin` is given then it must be a point strictly inside the polyhedron. If an interior point is not given then it is computed using a linear program and thus is slower than the first approach.
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This version does not compute the dual points, but instead it uses a traits class for handling predicates for dual points without computing them.
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If `origin` is given then it must be a point strictly inside the polyhedron. If an interior point is not given then it is computed using a linear program and thus is slower.
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This version does not construct the dual points explicitely but uses a special traits class for the function `CGAL::convex_hull_3()` to handle predicates on dual points without constructing them.
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\attention Halfspaces are considered as lower halfspaces that is to say if the plane's equation is \f$ a\, x +b\, y +c\, z + d = 0 \f$ then the corresponding halfspace is defined by \f$ a\, x +b\, y +c\, z + d \le 0 \f$ .
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\attention The value type of PlaneIterator (Plane) and the type of the origin (Point_3) must come from the same CGAL kernel.
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\attention The value type of `PlaneIterator` and the point type of `origin` must come from the same \cgal Kernel.
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\pre `origin` is inside the intersection of halfspaces defined by the range [`begin`, `end`).
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\pre if provided, `origin` is inside the intersection of halfspaces defined by the range `[begin, end)`.
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\pre The computed intersection must be a bounded convex polyhedron.
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\tparam PlaneIterator must be an input iterator where the value type must be Polyhedron::Traits::Plane
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\tparam PlaneIterator must be an input iterator where the value type must be `Polyhedron::Traits::Plane_3`
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\tparam Polyhedron must be a model of `ConvexHullPolyhedron_3`.
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\sa `halfspace_intersection_with_constructions_3()`
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@ -22,6 +23,6 @@ This version does not compute the dual points, but instead it uses a traits clas
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template <class PlaneIterator, class Polyhedron>
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void halfspace_intersection_3 (PlaneIterator begin, PlaneIterator end,
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Polyhedron &P,
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Point_3 origin);
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boost::optional<Polyhedron::Vertex::Point_3> origin);
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} /* namespace CGAL */
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@ -4,16 +4,16 @@ namespace CGAL {
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\ingroup PkgConvexHull3Functions
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\brief computes the intersection of the halfspaces defined by the planes contained in the range [`begin`, `end`). The result is stored in the polyhedron `P`.
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If `origin` is given then it must be a point strictly inside the polyhedron. If an interior point is not given then it is computed using a linear program and thus is slower than the first approach.
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If `origin` is given then it must be a point strictly inside the polyhedron. If an interior point is not given then it is computed using a linear program and thus is slower.
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This version constructs explicitly the dual points using the convex hull algorithm parametrized with the given traits class.
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\attention Halfspaces are considered as lower halfspaces that is to say if the plane's equation is \f$ a\, x +b\, y +c\, z + d = 0 \f$ then the corresponding halfspace is defined by \f$ a\, x +b\, y +c\, z + d \le 0 \f$ .
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\attention The value type of PlaneIterator (Plane) and the type of the origin (Point_3) must come from the same CGAL kernel.
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\attention The value type of `PlaneIterator` and the point type of `origin` must come from the same \cgal Kernel.
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\pre `origin` is inside the intersection of halfspaces defined by the range [`begin`, `end`).
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\pre if provided, `origin` is inside the intersection of halfspaces defined by the range `[begin, end)`.
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\pre The computed intersection must be a bounded convex polyhedron.
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\tparam PlaneIterator must be an input iterator where the value type must be Polyhedron::Traits::Plane
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\tparam PlaneIterator must be an input iterator where the value type must be `Polyhedron::Traits::Plane_3`
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\tparam Polyhedron must be a model of `ConvexHullPolyhedron_3`.
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\tparam Traits must be a model of the concept `ConvexHullTraits_3`.
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@ -24,7 +24,7 @@ template <class PlaneIterator, class Polyhedron, class Traits>
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void halfspace_intersection_with_constructions_3(PlaneIterator pbegin,
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PlaneIterator pend,
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Polyhedron &P,
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Point_3 origin,
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boost::optional<Polyhedron::Vertex::Point_3> origin,
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const Traits & ch_traits = Default_traits);
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} /* namespace CGAL */
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